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It needs to produce heat to heat the water which is the heat transfer medium. I was not intending to draw any distinction between heating and hot water, the fan blows cold air out in either case. The air comes out colder than when it went in at the back of the unit bc the heat in it has been tranferred by the refrigeration cycle in the HP from the ambient air to the water pipe which goes into the house. This initial process is the same whether it subsequently heats the house or the hot water. See here https://en.wikipedia.org/wiki/Air_source_heat_pump. -
Yes, ideally in an insulated cupboard. If you can get some insulated duct through them, and if the adjacent flues are dead, then it's a possibility - preferably the intake down one and the exhaust up another, so that the air from the latter doesn't contaminate the former. Though if connecting to a unit in the garage you'd ideally you'd take them through the garage wall / roof. -
My 25m2 garden building doesn’t have to comply with regs and we won’t be throwing money at it as it is just a man cave, but I still want it nice and useable. This idea would solve my ‘getting concrete down the bottom of the garden after we’ve built the house’ problem. I’m keen.
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It will work, it won't be efficient. If you're paying good money most companies will do whatever you want. Fit a heat pump in a totally unsuitable building, no problem etc. 99% of folk would feel warm underfoot and give the company rave reviews based on the feel good factor. Noting the extra expense will come later. Do all you can to mitigate heat losses elsewhere. On here @oranjeboom excavated his whole ground floor in his existing house then built back up with insulation and a new slab with UFH in. -
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